Why Did Mendeleev Leave Gaps in His Periodic Table?

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Mendeleev chose to leave gaps in his early version of the periodic table because he knew that those elements must exist, though they had not been discovered at the time. He was the first scientist to create a periodic table that arranged elements by their atomic mass, which brought the gaps to his attention. For example, he knew that there must be missing elements that had atomic weights greater than 65 but less than 75.
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The Periodic Table of Elements
Dmitri Mendeleev generally is credited with the creation of the first periodic table, which charts the chemical elements by atomic number and valence shell electron configuration.
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Mendeleyev left gaps in his periodic table because there weren't as many elements back in that time, and so he had to leave gaps for the elements that weren't discovered yet. He predicted
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Mendeleev's particular genius was to leave gaps for
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1. Mendeleev announced in 1871 that the gaps in his periodic table would be filled as new elements were discovered. He specified three gaps, all of which were filled by discoveries
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Please do not panic! Although Dmitri Mendeleev is credited with developing the periodic table in 1869, argon was not discovered until 1894. Source(s): WIKI-argon and WIKI-periodic
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